Google warns that the Russia-linked threat actor COLDRIVER expands its targeting and is developing a custom malware. The ColdRiver APT (aka âSeaborgiumâ, “Callisto”, âStar Blizzardâ, âTA446â) is a Russian cyberespionage group that has been targeting government officials, military personnel, journalists and think tanks since at least 2015. In the past, the groupâs activity involved persistent phishing […]